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Plans Fair Value of Plan Assets by Asset Class (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
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Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 340,854 |  | $ 340,854 | $ 335,663 | $ 370,497
Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 19,771 |  |  | 4,712 |
Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 19,879 |  |  | 47,916 |
Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 65,414 |  |  | 88,427 |
Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 665 |  |  | 1,427 |
Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 22,178 |  |  | 22,914 |
Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 6,538 |  |  | 8,796 |
Fixed Income Securities | US Government Agencies Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 10,531 |  |  | 5,909 |
Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,004 |  |  | 5,512 |
Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 9,993 |  |  | 10,539 |
Pending Transactions |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 62,000 | [3] |  | 5,000 |
Other Assets And Liabilities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets and (liabilities) | [3] | (133) |  |  | 70 |
Accrued (Expenses) Income |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | (79) |  |  | (97) |
Level 1 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 108,136 |  |  | 160,684 |
Level 1 | Equity Securities | Domestic Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [1] | 19,879 |  |  | 47,916 |
Level 1 | Equity Securities | Us Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 65,414 |  |  | 88,427 |
Level 1 | Equity Securities | International Companies |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 665 |  |  | 1,427 |
Level 1 | Equity Securities | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] | 22,178 |  |  | 22,914 |
Level 2 | Pension plans |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 49,837 |  |  | 35,468 |
Level 2 | Short Term Investments And Cash |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 19,771 |  |  | 4,712 |
Level 2 | Fixed Income Securities | US Treasury Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 6,538 |  |  | 8,796 |
Level 2 | Fixed Income Securities | US Government Agencies Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 10,531 |  |  | 5,909 |
Level 2 | Fixed Income Securities | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,004 |  |  | 5,512 |
Level 2 | Fixed Income Securities | Domestic Corporate Debt Securities |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 9,993 |  |  | 10,539 |
Other Investments Measured at Net Asset Value | International Equity Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2],[4] | 22,878 |  |  | 24,987 |
Other Investments Measured at Net Asset Value | Hedge Funds, Equity |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4],[5] | 35,054 |  |  | 32,095 |
Other Investments Measured at Net Asset Value | Absolute Return Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [4],[6] | 52,704 |  |  | 50,036 |
Other Investments Measured at Net Asset Value | Real Estate Funds |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [7],[8] |  |  |  | 17,296 |
Other Investments Measured at Contract Value | Guaranteed Insurance Contracts |  |  |  |  |  |
Schedule of Pension Plan Assets by Fair Value [Line Items] |  |  |  |  |  |
Fair value of plan assets | [7],[9] | $ 10,457 |  |  | $ 10,124 |
[1] | This class includes funds with the principal strategy to invest primarily in long positions in domestic equity securities.
[2] | This class includes funds with the principal strategy to invest primarily in long positions in international equity securities. This asset was reclassified from a Level 2 to a Level 1 type for all periods. This asset was incorrectly presented as a Level 2.
[3] | This class includes accrued interest, dividends, and amounts receivable from asset sales and amounts payable for asset purchases.
[4] | Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.
[5] | This class invests primarily in hedged equity funds.
[6] | This class invests primarily in absolute return strategy funds and are reported at NAV.
[7] | Certain investments, which are fully-benefit responsive investment contracts, are measured at contract value and have not been classified in the fair value hierarchy.
[8] | This class includes funds that invest primarily in U.S. commercial real estate.
[9] | This class invests primarily guaranteed insurance contracts through various U.S. insurance companies.

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